J. Bento - Taking over the responsibility of the RF-bypasses PS TFB PSB RF bypasses On behalf of: J. Bento - Taking over the responsibility of the RF-bypasses F. Chapuis - In charge of the RF-bypasses since 2000 J. Hansen – Design of the bypasses in the injection line B. Riffaud – Design of the bypasses in the injection line L. Zuccalli – Design of the bypasses in the injection line A. Blas ICL meeting 16 Nov 2016

PSB RF bypasses Executive summary: PS TFB PSB RF bypasses Executive summary: For the new injection line, 24 new collars including 76 new rf-bridges are presently being produced. It will then require 20 man-days on the rf side for preparation work + installation + tests For the PSB ring excluding the injection region, the existing 128 existing PSB isolated vacuum collars will be changed in case the present components fail the intensity test in the PS (corresponding to 1.6 E13 ppp in the PSB) to be completed in June 2017. This change implies around 50 man-days on the rf side + unknown effort on the vacuum side A. Blas ICL meeting 16 Nov 2016

PS TFB PSB RF bypasses 128 special vacuum collars installed downstream the bendings 100 spares without metallic paint and R-C circuit (handled by TE-VSC and P. Demarest) 500 new ceramic circuits to be ordered 3 times 0.5Ω in series with 4 x 100nF // => 384 circuits A. Blas ICL meeting 16 Nov 2016

In the injection region: 24 new special vacuum collars PS TFB PSB RF bypasses In the injection region: 24 new special vacuum collars including 76 special rf bridges Production launched Courtesy L. Zuccalli A. Blas ICL meeting 16 Nov 2016

In the injection region: 24 new special vacuum collars PS TFB PSB RF bypasses In the injection region: 24 new special vacuum collars including 76 special rf bridges Production launched Delivery: Jan 2017 A. Blas ICL meeting 16 Nov 2016

PSB RF bypasses Summary: PS TFB PSB RF bypasses Summary: The RF-bypasses for the new injection line will be ready in Feb 2017. 20 man-days (RF side) will then be needed for the installation and tests In case the presently mounted resistors in the PSB do not pass the intensity test in the PS (result June 2017), 128 collars will need to be changed in the PSB, meaning a 50 man-days effort (RF side only – vacuum not included) A. Blas ICL meeting 16 Nov 2016

Thank you! PSB RF bypasses Following slides: references PS TFB A. Blas ICL meeting 16 Nov 2016

Past measurements made by F. Chapuis PS TFB PSB RF bypasses References: Past measurements made by F. Chapuis \\cern.ch\dfs\Users\c\chapuisf\Public\ Preparation manual for the 128 collars by F. Chapuis https://edms.cern.ch/ui/#!master/navigator/document?D:1385242604:1385242604:subDocs Mechanical project for the injection line by L. Zuccalli, Accessible using: Smarteamv -> project ST0731260 A. Blas ICL meeting 16 Nov 2016

PSB RF bypasses http://cds.cern.ch/record/447073/files/ps-2000-025.pdf PS TFB PSB RF bypasses http://cds.cern.ch/record/447073/files/ps-2000-025.pdf http://cds.cern.ch/record/960437/files/cer-002626722.pdf http://indico.cern.ch/getFile.py/access?contribId=0&resId=1&materialId=slides&confId=59490 A. Blas ICL meeting 16 Nov 2016

The rf bypasses have to deal with: PS TFB PSB RF bypasses The rf bypasses have to deal with: Ibeam = 48 Ap with 2.5 E13 ppp Ibeam = 31 AP with 1.6 E13 ppp The Max peak beam intensity will be considered with 2.5E13 ppb and 130 ns bunch length 𝐼 𝑏𝑒𝑎𝑚 𝑝𝑒𝑎𝑘 𝐿𝑖𝑛𝑎𝑐 4 𝑎𝑡 𝑒𝑗 =𝜆 𝑝𝑝 𝑒𝑗 = 𝜋 2 ∙ 𝑄 𝐵𝑢𝑛𝑐ℎ 𝑇 𝐵𝑢𝑛𝑐ℎ = 3.14∙2.5∙ 10 13 ∙1.6∙ 10 −19 260∙ 10 −9 =48 𝐴 𝑝 A. Blas PSB-LIU meeting 01 Nov 2016

For the resistor, we need: 0.5 Ω resistor – as presently PS TFB PSB RF bypasses For the resistor, we need: 0.5 Ω resistor – as presently 0.5 W in continuous mode – 1W presently mounted 1150 W in pulsed mode (48Ap and 24 Vp ) – unknown specification for the present resistors Dimensions compatible with present setup A. Blas PSB-LIU meeting 01 Nov 2016

PS TFB PSB RF bypasses The present resistors - 0.5Ω /1 W – are (were) supposed to stand at least 1.4 A (for 1W) < 48 A No detailed specifications found for peak surges… but at least they did cope with the present centered beam => 4.6 A with 1E13 ppp and 180 ns bunch length 𝐼 𝑏𝑒𝑎𝑚 𝑝𝑒𝑎𝑘 𝐿𝑖𝑛𝑎𝑐 4 𝑎𝑡 𝑒𝑗 =𝜆 𝑝𝑝 𝑒𝑗 = 𝜋 2 ∙ 𝑄 𝐵𝑢𝑛𝑐ℎ 𝑇 𝐵𝑢𝑛𝑐ℎ = 3.14∙2.5∙ 10 13 ∙1.6∙ 10 −19 260∙ 10 −9 =48 𝐴 𝑝 A. Blas PSB-LIU meeting 01 Nov 2016

PSB RF bypasses Some resistors are specified for pulsed power. PS TFB PSB RF bypasses Some resistors are specified for pulsed power. Here below is the resistor that has been selected The length of this resistor (3.2x2.5x0.45mm) is half of the one used at present (6.5x3.2x0.42 mm)… so is the power (0.5 W instead of 1W) www.vishay.com/docs/20024/dcrcife3.pdf A. Blas PSB-LIU meeting 01 Nov 2016

PSB RF bypasses www.vishay.com/docs/20024/dcrcife3.pdf PS TFB PSB RF bypasses www.vishay.com/docs/20024/dcrcife3.pdf This resistor can stand 3000 W during 1 us (1150 W required during 130 ns) It can stand 0.5 W CW – as required – but still we will install 2 in // A. Blas PSB-LIU meeting 01 Nov 2016

PS TFB PSB RF bypasses Successful test ( J. Bento) in the PS with a peak current of 100 A (48 A needed in the PSB with 2.5E13, 31 A with 1.6 E13) A. Blas PSB-LIU meeting 01 Nov 2016